Surgical instrument and method of positioning an acetabular prosthetic component

Abstract

An orthopaedic surgical instrument for positioning an acetabular prosthetic component in a patient's surgically-prepared acetabulum includes a surgical tool configured to be coupled to the acetabular prosthetic component, and a gravity-based position indicator removably coupled to the surgical tool. The position indicator includes a first marking indicating a first position of the acetabular prosthetic component, and a second marking indicating a second position.

1 . An orthopaedic surgical system, the orthopaedic surgical system comprising:
 an acetabular prosthetic component sized to be positioned in a patient's surgically-prepared acetabulum, and   a surgical instrument comprising:
 a surgical tool configured to be coupled to the acetabular prosthetic component, and 
 a gravity-based position indicator removably coupled to the surgical tool, the position indicator including: 
   (i) a first marking indicating a first position of the acetabular prosthetic component in the patient's surgically-prepared acetabulum, wherein the first marking indicates a first abduction angle of the acetabular prosthetic component, and   (ii) a second marking indicating a second position of the acetabular prosthetic component in the patient's surgically-prepared acetabulum, wherein the second marking indicates:
 a second abduction angle of the acetabular prosthetic component different from the first abduction angle, and 
 a first anteversion angle of the acetabular prosthetic component. 
   
     
     
         2 . The orthopaedic surgical system of  claim 1 , wherein:
 the surgical tool has an aperture defined therein, and   the position indicator includes a rod shaped to match the aperture of the surgical tool such that the position indicator is coupleable to the surgical tool in a single predetermined orientation.   
     
     
         3 . The orthopaedic surgical system of  claim 2 , wherein
 the rod includes a support arm and a spring arm moveable relative to the support arm from (i) an uncompressed position wherein the position indicator is spaced apart from the surgical tool to (ii) a compressed position wherein the position indicator is coupled to the surgical tool.   
     
     
         4 . The orthopaedic surgical system of  claim 3 , wherein the spring arm is biased toward the uncompressed position to prevent detachment of the position indicator from the surgical tool when the rod of the position indicator is positioned in the aperture of the surgical tool. 
     
     
         5 . The orthopaedic surgical system of  claim 1 , wherein the surgical tool has a plurality of external threads formed on one end, the plurality of external threads corresponding to a plurality of internal threads of the acetabular prosthetic component to permit the surgical tool to be threadingly engaged with the acetabular prosthetic component. 
     
     
         6 . The orthopaedic surgical system of  claim 1 , wherein the position indicator includes a third marking indicating a third abduction angle of the acetabular prosthetic component. 
     
     
         7 . The orthopaedic surgical system of  claim 6 , wherein the third marking indicates a second anteversion angle of the acetabular prosthetic component. 
     
     
         8 . The orthopaedic surgical system of  claim 6 , wherein:
 the position indicator is bubble indicator having a vial with a bubble trapped therein, and   the first marking is located at the center point of the vial.   
     
     
         9 . The orthopaedic surgical system of  claim 8 , wherein the second marking is offset from the center point of the vial. 
     
     
         10 . The orthopaedic surgical system of  claim 9 , wherein a third marking indicating a third abduction angle of the acetabular prosthetic component is offset from the center point of the vial opposite the second marking. 
     
     
         11 . The orthopaedic surgical system of  claim 1 , wherein the first marking is a customized patient-specific marking. 
     
     
         12 . The orthopaedic surgical instrument system of  claim 1 , wherein the second marking is a customized patient-specific marking. 
     
     
         13 . The orthopaedic surgical instrument system of  claim 7 , wherein the third marking is a customized patient-specific marking. 
     
     
         14 . An orthopaedic surgical system for positioning an acetabular prosthetic component in a patient's surgically-prepared acetabulum, the instrument system comprising:
 an acetabular prosthetic component sized to be positioned in a patient's surgically-prepared acetabulum, and   a surgical instrument comprising:
 a surgical tool configured to be coupled to the acetabular prosthetic component, and 
 a gravity-based position indicator removably coupled to the surgical tool, the position indicator including: 
   (i) a first marking indicating a first position of the acetabular prosthetic component in the patient's surgically-prepared acetabulum, wherein the first marking indicates a first abduction angle of the acetabular prosthetic component, and   (ii) a second marking indicating a second position of the acetabular prosthetic component in the patient's surgically-prepared acetabulum, wherein the second marking indicates a second abduction angle of the acetabular prosthetic component different from the first abduction angle.   
     
     
         15 . The orthopaedic surgical system of  claim 13 , wherein the first marking is a customized patient-specific marking. 
     
     
         16 . The orthopaedic surgical system of  claim 13 , wherein the second marking a customized patient-specific marking. 
     
     
         17 . The orthopaedic surgical system of  claim 13  wherein:
 the surgical tool has an aperture defined therein, and 
 the position indicator includes a rod shaped to match the aperture of the surgical tool such that the position indicator is coupleable to the surgical tool in a single predetermined orientation. 
 
     
     
         18 . The orthopaedic surgical system of  claim 17 , wherein the rod includes a support arm and a spring arm moveable relative to the support arm from (i) an uncompressed position wherein the position indicator is spaced apart from the surgical tool to (ii) a compressed position wherein the position indicator is coupled to the surgical tool. 
     
     
         19 . The orthopaedic surgical system of  claim 18 , wherein the spring arm is biased toward the uncompressed position to prevent detachment of the position indicator from the surgical tool when the rod of the position indicator is positioned in the aperture of the surgical tool. 
     
     
         20 . The orthopaedic surgical system of  claim 14 , wherein the position indicator includes a third marking indicating a third abduction angle of the acetabular prosthetic component.